I don't think I showed this piece of evidence on this forum yet. It shows how the three important draconic aliased periods for QBO are discovered via machine learning.

![eu](http://imagizer.imageshack.us/a/img912/1410/pX5ZeD.jpg)
Fig 1: Eureqa results when applied to a QBO time-series 2nd derivative. The lowest error solution (shown in reverse highlighted blue) feature as strongest sinusoidal factors the three seasonally aliased Draconic harmonics.

![line](http://imagizer.imageshack.us/a/img921/6223/oi6jJE.png)
Fig. 2 : Alignment of the three strongest sinusoidal periods found via machine learning with those predicted via seasonally reinforced Draconic lunar tidal periods.

More details here: http://contextearth.com/2016/02/13/qbo-model-validation/